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Finding the Fourth Proportional to 2,856.51, 4,285.45 and 908.72

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Solution

The fourth proportional to 2,856.51, 4,285.45 and 908.72 is: 1,363.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,856.51 : 4,285.45 = 908.72 : x
  2. Step 2: Convert to fraction form
    2,856.51/4,285.45 = 908.72/x
  3. Step 3: Cross multiply
    2,856.51x = 4,285.45 × 908.72
  4. Step 4: Simplify right side
    2,856.51x = 3,894,252.70
  5. Step 5: Solve for x
    x = 3,894,252.70/2,856.51
  6. Step 6: Final answer
    x = 1,363.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.